When your heart doesn't function you can't feel the effects of rheumatoid arthritis.
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the relation between math anxiety and excited intelligence
Good question. A relation is simply that; any x-value to create any y-value. A function, however, cannot be defined for multiple values of x. In other words, for a relation to be a function, it must have singular values for all x within its domain.
cost or input
A function is a relation whose mapping is a bijection.
The sample regression function is a statistical approximation to the population regression function.